Overview
In the cybersecurity landscape, the discovery of a new vulnerability always raises concerns. A recent one that has caught attention is CVE-2025-6733, a critical buffer overflow vulnerability found in UTT HiPER 840G up to version 3.1.1-190328. This vulnerability affects the API component of the device, particularly the function sub_416928 of the file /goform/formConfigDnsFilterGlobal. The manipulation of the argument GroupName can lead to a buffer overflow, which could potentially cause severe damage to the integrity of the system.
This vulnerability is of significant concern due to its severity and the fact that the exploit has been publicly disclosed. This means that potential attackers are aware of the vulnerability and can exploit it. The vendor was notified about this issue, but they haven’t responded yet, heightening the risk.
Vulnerability Summary
CVE ID: CVE-2025-6733
Severity: Critical – CVSS Score: 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
UTT HiPER 840G | Up to 3.1.1-190328
How the Exploit Works
The vulnerability resides within the function sub_416928 of the file /goform/formConfigDnsFilterGlobal. When a remote attacker sends specially crafted input to the GroupName argument of this function, it triggers a buffer overflow. This overflow can cause the system’s memory to be overwritten, potentially leading to arbitrary code execution, system crashes, and data leakage.
Conceptual Example Code
Here’s a conceptual example of how the vulnerability might be exploited. Note that this is for illustrative purposes only:
POST /goform/formConfigDnsFilterGlobal HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "GroupName": "A"*10000 }In this example, the GroupName argument is filled with a string of ‘A’ characters that exceed the buffer’s capacity, leading to overflow.
Mitigation Guidance
To mitigate the risk posed by this vulnerability, users are advised to apply the vendor patch as soon as it’s available. Until then, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be employed as temporary mitigation measures. These systems can help detect and prevent potential exploit attempts.